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| MAX3724-MAX3725 Datasheet, PDF (1/10 Pages) Maxim Integrated Products – 3.2Gbps SFP Transimpedance Amplifiers with RSSI | |||
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19-3181; Rev 0; 2/04
3.2Gbps SFP Transimpedance
Amplifiers with RSSI
General Description
The MAX3724/MAX3725 transimpedance amplifiers pro-
vide a compact, low-power solution for communication
up to 3.2Gbps. They feature 325nA input-referred noise
at 2.1GHz bandwidth (BW) with 0.6pF input capaci-
tance. The parts also have >2mAP-P AC input overload.
Both parts operate from a single +3.3V supply and con-
sume 93mW. The MAX3724/MAX3725 are in a compact
30-mil x 50-mil die and require no external compensa-
tion capacitor. A space-saving filter connection is pro-
vided for positive bias to the photodiode through an
on-chip 580⦠resistor to VCC. These features allow
easy assembly into a low-cost TO-46 or TO-56 header
with a photodiode.
The MAX3724 and MAX3748A receiver chip set pro-
vides an RSSI output using a Maxim-proprietary* inter-
face technique. The MAX3724 preamplifier, MAX3748A
postamplifier, and the DS1858/DS1859 SFP controller
meet all the SFF-8472 digital diagnostic requirements.
Applications
Up to 3.2Gbps SFF/SFP Optical Receivers
Optimized for Small-Form-Factor Pluggable (SFP)
Optical Receivers
*Patent pending.
Features
⦠Wider Bandwidth than MAX3744/MAX3745
⦠RSSI Implementation in 4-Pin TO-46 Header
(MAX3724 and MAX3748A)
⦠8psP-P Deterministic Jitter for <100µAP-P Input
Current
⦠325nARMS Input-Referred Noise at 2.1GHz
Bandwidth
⦠28mA Supply Current at +3.3V
⦠2.5GHz Small-Signal Bandwidth
⦠2.0mAP-P AC Overload
⦠Die Size: 30 mils x 50 mils (Identical to the
MAX3744/MAX3745)
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX3724E/D
-40°C to +85°C Dice**
MAX3725E/D
-40°C to +85°C Dice**
**Dice are designed to operate with junction temperatures of
-40°C to +110°C but are tested and guaranteed only at TA =
+25°C.
Typical Application Circuit
SFP OPTICAL RECEIVER
400pF
400pF
VCC
FILTER OUT+
MAX3724
IN OUT-
GND
4-PIN TO CAN
VCC
IN+
OUT+
MAX3748A
IN-
OUT-
RSSI DISABLE LOS
3.3kâ¦
0.1µF
0.1µF
DS1858/
DS1859
VCC
HOST
BOARD
VCC = 3.3V
4.7kâ¦
TO
10kâ¦
MOD-DEF1
MOD-DEF2
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maximâs website at www.maxim-ic.com.
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